note the use of a Negative Polarityany in an island situated in a
lake located in another island (the construction is called an "Embedded NP
Complement", and is considered a very baroque structure; see Ross
1967). This is an extremely well-insulated NPI (one might even call it
"double-insulated"). Given the squishy nature of NPI's (see some
reference or other by Ross), one might guess it would require a
really strong negative trigger.

But note further that the locus of the triggering negative in this
sentence is the matrix verb refute, two S's (and two islands)
above the trigger site in the Embedded NP Complement. Not only is this
site syntactically remote from the triggering locus, but the semantic
negation of this verb is not even overt. Rather, it is an entailment of
a causative verb (refute) with incorporated negative (i.e,
refute means cause to become false); to paraphrase:

"I have caused to become false
your claim [that [S
... the claim [that [S
... any 'rights' at all]]]]"

{thus, by regular causative entailment, your claim is not true}

Brutus Force of the Center for Quantitative Syntax has determined that
the negative field required to trigger a modifying any accompanied by
an at all in a Complex Noun Phrase must be above 1800
millihorns, or 7.8 on the Nichter Scale. This value can be expected to
be even higher for a doubly-embedded Complex NP locus; this, says
Force, is the highest negative polarity field ever measured in an
English sentence.

Research is now proceeding on eddy currents of
induced doubt in isolated negative fields.